/*
 * Copyright (c) 2009 Piotr Piastucki
 * 
 * This file is part of Patchca CAPTCHA library.
 * 
 *  Patchca is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *  
 *  Patchca is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *  
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with Patchca. If not, see <http://www.gnu.org/licenses/>.
 */
package com.jrelax.third.captcha.filter.library;


public class RippleImageOp extends AbstractTransformImageOp {

	protected double xWavelength;
	protected double yWavelength;
	protected double xAmplitude;
	protected double yAmplitude;
	protected double xRandom;
	protected double yRandom;

	public RippleImageOp() {
		xWavelength = 20;
		yWavelength = 10;
		xAmplitude = 5;
		yAmplitude = 5;
		xRandom = 5 * Math.random();
		yRandom = 5 * Math.random();
	}

	public double getxWavelength() {
		return xWavelength;
	}

	public void setxWavelength(double xWavelength) {
		this.xWavelength = xWavelength;
	}

	public double getyWavelength() {
		return yWavelength;
	}

	public void setyWavelength(double yWavelength) {
		this.yWavelength = yWavelength;
	}

	public double getxAmplitude() {
		return xAmplitude;
	}

	public void setxAmplitude(double xAmplitude) {
		this.xAmplitude = xAmplitude;
	}

	public double getyAmplitude() {
		return yAmplitude;
	}

	public void setyAmplitude(double yAmplitude) {
		this.yAmplitude = yAmplitude;
	}

	@Override
	protected void transform(int x, int y, double[] t) {
		double tx = Math.sin((double) y / yWavelength + yRandom);
		double ty = Math.cos((double) x / xWavelength + xRandom);
		t[0] = x + xAmplitude * tx;
		t[1] = y + yAmplitude * ty;
	}

}
